Die-cutting machine



Jan. 4,1927. Y 1 1,613,571 J. C. FLETCHER DIE CUTTING MACHINE Filed Dec. 6, 1923 5 Sheets-Sheet l INM-f. l? 1 i; v /l/ 3 Z8 i 4 I r A; e, 6a *MMM "I- I 4 Jan. 4, 1927. 1,613,577 J. c. FLETCHER DIE CUTTING MACHINE Filed Dec. 6. 1923 5 Sheets-Sheet 2 5% Q g i w 1 Q xm |11 Q 0 Q si 0D uO H- lq Q sa l

' N lq 0 0 o v) lq l o 1 Q I :IB g o m 1f g /l L\ /dZJe/zoz Jan.' 4. 1927.

1.613,57? J; c. FLETCHER DIE CUTTING MACHINE Filed Dec. 6,

5 Sheets-Smet 3 l Jan. 4 1927.

1,613,577 J. c. FLETCHER DIE CUTTING MACHINE Filed Dec. 6. 1923 5 Sheets-Sheet 4 fg @vf-LM J l 4 D an 1927 J, c; FLETCHER DIE CUTTING MACHINE Filed Dec. 6, 1923 5 Sheets-Sheet 5 defzioz'/ 6, Jseph @fiek/Zea fi, Myx W5 Patented Jan. 4, 1927.

UNITED STATES 1,613,517 PATENT OFFICE.

JOSEPH C. FLETCHER, OF CHICAGO, ILLINOIS, ASSIGNOB TO ARMSTRONG BROS. TOOL CO., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

DIE-CUTTING MACHINE.

Application filed December 6, 1923. Serial No. `678,848.

This invention relates generally to die bobbing machines, and more particularly to onel for hobbing and chamfering by the same too 5 One object is to provide a tool of the hobbing type combined with a suitable cutter for chamfering.

Another object is to Vprovidemechanism for using such a tool to cut back or relieve the die.

Still another object is to provide a simple conlstruction for feeding the work onto the too Another object is to provide a method for withdrawing the hob from engaging the die teeth during the process of chamfering.

Still another object is the provision in the machine of suitable mechanism to permit cutting of left and right hand threads with- 20 out varying theoperation of the machine.

The method employed in the disclosed embodiment of my invention for hobbin and chamfering, is to control the axial feedlng of the rotating work, and to reciprocate a rotating tool in a plane perpendicular to its axis of rotation, the reciprocation of the tool and the rotation of the work being in timed relation to each other.

The tool employed in my invention may 30 be of several types. Preferably it embodies a hob portion to cut the threads, which portion may be straight or tapered, and a bevel or tapered cutter portion of larger diameter than the hob, for chamfering.

The reciprocation of the tool is timed by the rotation of the work in such a manner that as the tool forms each portion of the die, it cuts progressively deeper to produce the relief required in the die. Further, the length of the path of reciprocation is normally fixed, but the path as a whole with relation to the work may be oi'set in order that the hob portion of the tool may clear the cutters in the die to permit the larger por- 45 tion of the to-ol to chamfer the die, and

likewise relieve the chamfered portion.

The axial feeding of the work is automatically controlled by the rotation thereof in order to produce thc required pitch. According to the type ot tool employed. the feeding of the work may be automatic and continuous for bobbing, suitable adjustments being provided in a machine embodying my invention, to permit chamfering before or after the hobbing process, while the tool is offset, and thus free from Contactin the teeth of the die as in the above mentione bobbing process.

In a machine embodying my invention many features may be incorporated to facilitate automatic operation for rapid production. Such a machine may be constructed specially for the results desired. I have explained that my invention may use a variety of forms of tools and that the process mayy be operated 'in a variety of ways, more especially related to the type of tool chosen for the work and the type of thread desired. In order to explain my invention and the various manners in which it may be employed, I have shown in the drawings one form 'of machine embodying the principles of the invention.

In the drawings: 4 Fig. 1 shows a fra entary cross-section through an uncut die liink.

Fig. 2 is a fragmentary cross-section along the line 2-2 of Fig. 3 of the completed die showing one insert in elevation and two in profile.

the irection of the arrow 3.

Fig. 4 illustrates a detail of a movable temporary stop for the work slide.

Fig. 5 shows a front view of the, whole machine.

Fig. 6 is a plan view of the same.

Fig. 7 shows a right end view of the machine as positioned in Fig. 5.

Fig. 8 shows a view towards the plane of line 8 8 in Fig. 5.

Fig. 9 is a vertical section along the line 9-9 of Fi 6.

Fig. 10 s ows a left end View chine as positioned in Fig. 5.

Fig. 11 is a cross-sectional view of the eccentric mechanism of Fig. 10 along the line ll-vll.

Fig. 12 is likewise a sectional view of the offsetting eccentric of Fig. 10 along the line 12-12.

In Fig. 1 I have illustrated a spirally gashed tool 20 which has a slightly tapered portion 21 with a multiplicity of annular cutter teeth. The tapered cutting portion 22 is a chamfering tool, the two yportions forming a unitary rotary tool, the spiral gashes 23 being commento both portions of of the ma- 3 shows a view of Fig. 1 looking in l the tool. Any suitable means forseeuring the tool for rotation may be employed, as the usual spindle shank 24.

Fig. 2 shows the die 25 of Fig. 3 in section along the line 22. The die for which my invention is particularly adapted is any die presented a number of cutting tools in circumferential arrangement. The die 25 has four of these tools. or inserts as they are called, 26, 27, 28. and 29. These are tool steel cast into the block 25 in the arrangement shown. Fewer or more of these may be used, but four are shown herein. ln Fig. 2 the insert 26 shows the profile of the tinished work and insert 28 indicates the same, the teeth in the face 28 (Figs. 2 and 3) being more remote from the center of the die than those in the face 28" (Fig. 3). whereby the required relief is obtained. The dotted lines a and b (Fig. 3) represent arcs in the circular path of the front and back po'rtions of a finished tooth in the inserts.

Fig. 3 indicates the horizontal reciprocation of the tool 20. During.r the time that theinsert 29 passes the cutter. with the die 25 rotating in the direction ot the arrow. the tool 20 moves outwardly towards the left, so that `,it first cuts the insert. at circle-a an leaves the insert cutting` on circle b. While the space between the inserts passes the tool the. tool moves inwardly to a position from which it can advance into the next approaching insert. Thus in one revolution of the die 25, the tool reciprocates as many times as there are inserts in the die.

'The feeding of the work onto the tool gives the renuired pitch. In addition to the relative longitudinal motion. the machine described provides mechanism to move the tool inwardly towards the center of the die to clear the inserts. whereupon there is permitted a more rapid feed upon the larger chamteringl portion 22 of the tool 20. .In the offset position, the chamfering may be done first and the bobbing second. Thus the machine may be constructed to alternate the sequence of the operations on successive blanks.

In the machine described. there is mechanism for doing this in one direction. In Fig. 5 the machine referred to comprises generally the frame 30, the horizontallv movable tool slide 31 on ways 32 and the longitudinally movable work slide 33 on ways 34. The tool carrying slide 31 receives power direct by pulley 35 on a main shaft or spindleV 36 in the end of which a suitable helder 37 grasps the tool 20.` Fig. 10 shows the end view of this slide with the gear train 37. 38. 39, from the shaft 36 to a shaft 41 at the rear of the head 31. The gears 38 and 39 are secured in slots 42 and 43 in the pivoted arms 44and 45 respectively. so that other speed ratios may be obtained by substitution in the gear train.

d ing means the location of the head 31 is Power is transmitted to the work slide 33 by the shaft 41 through the universal joint 44 on shaft 45 in the work slide. Connec tions to be later described transmit power from the work slide through shaft 46' to a suitable mechanism cansinor the reciprocation of the tool slide 31. For this purpose I have provided an eccentric device herein shown as a crank the details of which may be varied from the following description.

On the frame ofthe machine is the bracket 47 (Figs. 10 and 6) with the shaft 48 bearing therein. A universal 49 is used to connect shaft 48 to shaft 46 in this instance, because the two are out of line. The two flanges 50 (Fi 113 divide the shaft into two portions, olte together by bolts 5l, the slots 52 in the flanges permitting an axial adjustment of the two flanges. This forms an axially adjustable coupling by which is varied the phase relation of reciprocation of the slide 31 to the rotation of the die blank. The shaft 48 has a head 53 at the other end with a T-slot 54 diame'trically therethrough. In the slot is a headed bolt 55, with the sleeve and collar 56, washer 57, and nut 58. By these clampthe bolt is made variably eccentric as is r uired, thus constituting bolt 55 as a ra ially adjustable crank pin.

I next provide means for transforming the eccentricity into reciprocation of .the tool-carrying slide 31 over a given path and also means to quickly displace the path of the reciprocation of the slide so as t-o move the tool out of thread-cutting relation with the inserts of the blank. For this urpose I use a connecting rod or link 59 wit i a sort of turn-buckle connector 60 therein for semipermanent adjustments. lVith the turn buckle device various sizes of dies may be threaded without changing the hob or milling cutter. One end of link 59 is pivoted about the sleeve 56 having the eccentric motion. On

a bracket 61 facing the operator. Rigid therewith is a circular dial 62. Through the bracket and dial passes a shaft 63 having an eccentric portion 64 and a lever and handle 65. A looking pin 6G is adapted to lock the lever in position in holes 67 about the peripher ofthe dial 62. The eccentric 64 recexves the remaining end of the link 59. It is readily seen by reference to Fig. 10, that a movement of the handle 65 through 180 serves to vary the effective length of the rod 59 .by an amount equal to the eccentricity of 64. It is this arrangement which readily offsets the tool 24 out of cutting relation to the insertsv on the die.

As a result of the above described arrangement certain advantageous features become inherent with a machine emploving any construction producing the same kind of stroke as does the above mechanism. It

Cil

is obvious that withrotation ofthe shaft 48 the tool is never horizontally stationary. With reference to a constant speed for the shaft 48, its motion is a simple harmonic displacement between the limits of its travel. During `one half of a completed cycle the motion in one direction varies from nearly imperceptible motion, through a maximum speed slowing down to imperceptible motion before reversal of direction. By adjustment of the axial relation of the flange couplings 50, the amount of displacement of the tool durin 'the parsage of an' insert may be varie without changin the length of the stroke. B the adjusta ility 4of the fiance coupling t e relief can be reversed from tie direction shown. Such would be required in making a die for a left-hand thread as will be hereinafter set forth. In other words, the flange coupling permits variation in the phase angle of reciprocation and rotation. `While the above adjustments may be made through the flange couplings 570, 1t may also more rreadily be made by sliding the pin 55 in its T-slot 54 to vary the displacement of the tool. By sliding thc pin pastthe center of the T-slot the machine will be adapted to cut the left hand threads.

The work slide of the machine designated generally by the numeral 33 serves to hold the rotatin work, to feed it axially and automatical y to control itself in important respects. For example, I desire to provide an lmpositive power drive in order that the machine will not function and thus be damaged if it should become jammed. Likewise it is desirable to provide automatic means to disengage the power at the end of the feed, and a mechanism to prevent feeding during rotation.

With certain fine threads I have found that the relief on the hob teeth is s'ifiicient to accommodate the helical angle of lead of the inserts in a horizontal position of the die axes. However for coarse threads an angular adjustment is provided to effect cutting with the desired helical angle. I provide means for varying the angularitv of the work axis and rotary tool axis. This adjustment is incorporatedpreferably in the head about to be described. The head stock which I employ is in two parts 33 and 33. The latter is a base member slidable on the ways 34 between suitable stops 66. 67 and 68. In Fig. 4 a detailed view of stop 66 is shown. This stop is to provide a preliminary stop for the setting of the slide in starting position. It is held in a pivoted member 69 with a throw handle 70. The dotted line, show it in its inoperative position.

The base 33 (Fig. 7) has a rack 71 on the under side by which the hand wheel 72 feeds the table through shaft 73 carrying pinion 74. The upper portion 33 is pivoted to the base 33 through the 1ine`75. Upri ht ears 76 on the base 33 have arcuate sots 77 therein through which pass the bolts 78 in the head 33 for clamping the same in its adjusted position. The jack screw 79 between 33 and 33a serves to change the angulai-ity of the work with respect to the axis of the tool in order to vary the helical angle in the die. In the present embodiment the back end of 33 is lowered for right hand threads and raised for left hand threads. When this angular position is used the remaining parts of the machine are set so that the die and rotary tool cut an insert in a horizontal plane. However, it is not necessary that the adjustment be in 'a vertical plane, other arrangements being equally practicable having due regard for the position of the cutter with reference to the die in the particular machine embodying the invention.

The 'upper head 33 is provided with two bearings 80 and 81 for a main spindle 82. This spindle is integral from the end carrying a chuck 83 for the work to the end having a handwheel 84. The s indle is slidable in the bearing 80, throng the feeding means in the other bearing. The bearin 81 has a removable cap 85 within which 1s a split nut 86 locked thereto as by a screw pin 87. 0n the rotating spindle a threaded portion is provided, which is adapted to feed the spindle by engagement with the split nut 86. The means by which this is accomplished is so associated with the general construction of the whole mechanism that the latter will be described as a whole.

The impositive drive which I prefer to use for the spindle 82 comprises a positively driven worm gear 88 having friction material connected therewith. Cork plugs 89 have proven suitable for this purpose. The worm gear 88 is normal] free to turn between flange plates 90 an 91. On -the shaft y82 between the bearings 80 and 81 is a sleeve 92 splined to the shaft at 93. The flange 90 is keyed tixedly to the sleeve 92 against a shoulder thereon. A loose collar 94 about the sleeve 92 carries the wormy gear 88 and the flange 91. A compression spring 95 forces the flange plates 90 and 91 to receive power through the cork plugs 89 by frictional contact, an adjustable nut 96 varying the compression of the spring by its position on the threaded end 97 of sleeve 92.

The feeding mechanism and the power transmission to the reciprocating mechanism for the tool slide have a common relation and will be described together. Loose on the spindle 82 I provide a threaded sleeve 98 integral with a head portion 99. The sleeve 98 and the split nut 86 determine the pitch of the die to be cut. The hand wheel 84 is removable to permit replacing the sleeve 98 and nut 86 with a set of a different pitch.

ila

The head 99 lits within a gear 100 keyed to the shaft. A sleeve 101, unitary with the handwheel, is also keyed to the shaft, the nut 102 fixing all in compact relation.

WVhen the shaft 82 rotates the gear 100 likewise rotates, but feeding will not take place till the head 99 is positively connected to a rotating member. I prefer to do this by engaging the head 99 with the gear 100 by means of the slidable pin 103 situated within the head. A knob or pin 104 secured in the pin 103 serves to move it in and out of engagement in gear 100. When it is disengaged froni the gear, friction may cause feeding, so that I have provided a slidable block 105 (Figs. 5 and 6) on the bearing cap 85. A hole in the block retains the pin and the clamping nut 106 holds the block fixed in place. A suitable train of gears 10T- 10B-109 transmits power from the gear 100 to the shaft 46 connected to the eccentric mechanism of the tool slide. The gear 109 is splined onto the shaft 46 ito permit the longitudinal motion of slide 33. The ratio from gear 100 to shaft 46 is 1 toV n where fn. is the number of inserts in the blank.

The nie-ans for transmitting power to the gear 88 is adapted for automatic disengagement at the end of the feeding stroke.

One manner in which I accomplish this is as follows: As has been stated above the shaft (Figs. 5-6-6) furnishes the power to the work slide. A bevel gear 110 o'n the shaft 45 meshes with a bevel gear 111 on a shaft 112. The gear 110 is splined onto the shaft in order that the shaft may slide therethrough'in the movements of thc base 33 on its ways. A swinging arm or bracket 113 is pivoted about the shaft 45 so as to carry the shaft 112 within the same, while permitting continuous engagement of the bevel gearing.`

A worm screw 114 on the shaft 112 engages A the worm gear 88 when the arm is raised to the position shown in Fig. 8.

Ordinarily the weight of the bracket 113 and its various parts is sufficient to draw it away from the gear 88, but if desired spring means may be added to draw it away. So in order to transmit power a lock is provided in the form of a lever 115 pivoted at 116 to the head The lever and bracket member have a slot and pin connection 117 so that the lever 115 is a manual means to raise it into place. The weight of the bracket tends to raise the forward end of the lever115 so that a lock 118 is placed over it to hold it in its depressed position. In order to release the lock automaticallv I have placed the same on a rocker 119 pivoted at 120. Y A spring pressed pin 121 tends to hold it in .locked position. 'lhe rocker 119 has a leg and foot extension .122, the depressing of which will release the lock 118 to permit disengaging of the power.

In the machine as herein described I have used a hob of such length that two revolutions of the die blank are sufficient to complete the bobbing operation. This is clearly represented in Fig. 1. I desire to trip the locking means above described at the .end of two rotations of the blank. For this purpose I lace upon the spindle a gear 123, here ma e as a part of the chuck head. This is adapted to mesh with gear 124 to give a ratio of 1 to 2, this gearing being on a stub shaft 125 in the work slide. An adjustable pin 126 in this gear is arranged to trip the foot 122 to release the lock.

In operating the machine described, a i

blank is placed in the chuck 83 while the base 33 is moved towards the stop 68. When properlyT placed the die blank can be moved forward and the tool enters between two of the blank inserts. The hand wheel 72 is used to bring the work slide up to stop 66, its operating position, where it remains. The pin 103 is moved to engage the gear 100. During all this the tool is rotating and likewise the worm screw 114. The operating lever 115 is depresed to transmit ower to the. worm gear 88. Through the iiictional contact, the spindle 82 revolves freely and quite rapidly until an insert arrives at the tool, when it may be slowed down somewhat by slippage in the friction elements. The rotation of the blank effects lateral reciprocation of the tool slide 31 through the gears 100, 107, 108, 109, shaft 46, universal 49, to shaft 48 and the eccentric pin 55. At the end of two revolutions of the blank the trip device 119 operates leaving the pin 104 (Fig. 5) in osition to be moved towards and into the lock 106 to stop feeding. On the cutter slide the lever 65 is turned manually-to offset the tool to free it from engaging the inserts. The power is again set to' ciprocation of the tool carrying slide 31'V continues so that the chamfer likewise is relieved as well as the threads. wheel 84 is used to turn back the feed screw before repeating the operation.

However, the above is not the required sequence of operation. With the tool in the offset position the chamfering may be done first, then the bobbing.

It is now obvious that the principles disclosed are capable of combination in a variety of ways to produce a machine capable of quickly forming dies on a production basis. Additional well known automatic means may be incorporated in various embodiments of the invention, some of which have been described, in order to eliminate The handmanual operations which the above ldecomprising a hob portion an and other means to feed the die scribed machine employs. H owever, these details form no part of my Invention and the foregoin descriptionis not to be construed as limiting my invention short of the prior art inv view of the appended clalms.

I claim as my invention:`

1. Amachine of the' class. described, comprisin in combination a base, two carriages on said vbase movable at right angles to'each other, a driving pulley carried by one of said carriages, a ilexlble owerconnecton from said pulley to the ot 1er carriage, said connection including cnt-olf mechanism, a tool spindle on the pulley-carrying carriage, con-- nected with said pulley, a work spindle on the other carriage controlled by t e cut-olf mechanism of sald flexible power connection, and means tomove both carriages by rotation of the work spindle.- 2. I n adie bobbing machine a rotary tool a larger tapered cuttenportion, automatic means to feed a rotating die blank relatively onto the hob portion, means to'move the tool and blank relatively whereby. to free the hob portion of the tool from action on the die blank, blank rela tively onto the cutter portion.

3. In a die bobbing machine a rotary tool comprising a hob portion an a larger tapered cutter portion, means to produce relative feeding of a rotatin die blank alon the hob portion of the too and into the pat of the cutter ortion and means to move the tool and the b ank re atively whereby to free the hob 4portion from action on the blank,

'while the larger tapered cutter portion remains effective on the blank.

4. In a die hobbing machine, a rotary tool comprising a hob portion and a tapered cutter portion, means to feed a rotating die blan onto the hob portion, means tooflset the hob from cutting relation to the die, and

other feeding means to feed the die blank4 onto the tapered cutter portion, whereby the chamter is produced, thetool being capable ing of aY rotating die blank along of a reciprocatory motion normal to its axis in timed relation to the rotation of the blank, whereby the relief in the die is produced.

5. In a die bobbing machine, a rotary tool comprising a hob portion and a taperedcutter portion, means to produce relative feedthe hob portion, means to offset the hob an die from cutting relation, and other feeding means to feed relatively the die blank and the tapered cutter portion, whereby the charnfer 1s produced, the tool and the work having a relative reciprocation normal to the axis of' the tool in timed relation to the rotation of the blank, whereby relief in the cutter threads is produced.

6. In a machine of the character described,

having a base with a carriage thereon caru rying a cutter spindle, means to move the carnage transversely of the axis ofthe tool, comprising a rotary shaft` rigid with the bedan eccentric thereon, an adjustably fixed eccentric on the carriage, a link connecting said two eccentrics whereby rotation of the first eccentric reciprocates the carriage and whereby the shlftlng `of the second eccentric shifts the carriage independently of the reciprocation.

7. In a machine for forming thread cutting tools, a rotary tool comprising a hob portion and acutter portion ofv different diameter thanthe hob portion, means to roduce relative feeding of the rotating b ank along the hob portion, means to offset relatively` the tool and the blank to brin the hob portion out of cutting relation wi the blank and 'to kee the cutter portion vin Vcutting relation to t e blank, and means to feed the work on to the cutter ortion.

8. In a die bobbing mac `ne, a rota toolcarrying spindle, a rotary work'spin e, one of said spindles having a reciprocato motion normal to its axis of rotation, said reciprocation being timed to the rotation of the work cut by the tool, and means to shift the tool in the direction of reciprocation independently thereof out of cutting relation with the work.

9. In a die bobbing machineof theclass described, having a work spindle, and a tool slide, a power driven tool Spindle on the tool slide, impositiva drive connections from said tool spindle to the work spindle, positive driveconneotions from the work spmdle to a mechanism adapted to reciprocate the tool carrying slide.

10.-- ln a die bobbing machine of the class described, having a work spindle, and a tool slide, a power driven tool spindle on the .tool slide, impositve drive connections from said .tool spindle to the work spindle, positive drive connections from the work spindle to a mechanism adapted to reciprocate one of' said slide's perpendicular to the axis of its spindle.

11. In a die hobbing machine of the class described, having a work spindle, and a tool slide, a power driven tool spindle on the tool slide, impositiva drive connections from said tool spindle to the work spindle, positive` drive connections from the Work spin- 4dle to a mechanism adapted to reciprocate having a base and a movable slideon saidv base, a reciprocating mechanism for said slide, comprlsin a rotary shaft axially fixed relative to the ase, an axiall adjustable coupling in said shaft, a radial y adjustable crank pin extending from the end of said 'shaft, an eccentric' element on the slide,

means to turn said element lo'n,'an axis parallel to the rotary shaft, and a connecting rod between the crank pin and the eccentric element.

14. In a machine of the class described having a base and a movable slideon said base, a reciprocating 'mechanism for said Slide comprising a rotary shaft fixed relative to the base Van axially adjustable coiphng on said shaft, a radially adjustable cra pm extending from the end of said shaft, a connecting rod from said crank pin to the slide, and means to vaxliy the effective length of said connecting ro 15. In a machine of the classdescribed havin a laterally reciprocatory rotary tool, a wor p slide, comprising a positively driven shaft, a main spindle, a rotary member impositively connected to said spindle means to engage the driven shaft withsaid rotary member, a feed nut and screw device axially alined with said spindle means to connect said feed deviceto said spindle, whereb the spindle is' fed by the rotation ther-eo y,

and tripping means operated by a redetermined rotation of the spindle to Idisengage the driven shaft from the rotary member.

16. In a machine of the class described .havin a laterally reciprocatory rotary tool, a wor head comprising a base portion slidable longitudinally of the machine, means to sli e said base, an upper portion .having pivotal connection with said base,

whereby to permit angular adjustment relative to the axis of the rotary tool, a main spindle bearing in said upper portion, means to drive sai spindle impositivelyy and means to feed said spindle y the rotation thereof with respect to the upper portion, the base remaining stationary, and mecha-- nism operated by the rotation ofthe spindle adapted'to be connected to mechanism for reciprocatin Vsaid rotary tool.

17. In a mac ine of the class described having a rotary tool `in one slide, and a rotary work spindle in another slide, rapid feeding means to move the spindle slide,

mechanical feeding means to feed the spin` dle with respect to its slide, eccentric mechanism operated by the rotation of the spindi)Y dle to reciprocate the tool slide, an impositive power transmission from the rotary tool to the work spindle, and automatic Vtripping means associated with said trans- Amission to render it inoperative.

, In testimony whereof, I have hereunto aixed my signature.

JOSEPH C. FLETCHER.

adapted to reciprocate one of said slides, and separate, means to disengage said two drive connections.

13. In a machine of rthe class described having a base and a movable slideon said base, a reciprocating mechanism for said slide, comprisn a rotary shaft axially fixed relative to the iase, an axiall adjustable coupling in said shaft, a radial y adjustable crank pin extending from the end of said 'shaft, an eccentricl element Aon the slide,

means to turn said element on an axis parallel to the rotary shaft, and a connecting rod between the crank pin and the eccentric element.

14. In a machine of the class described having a base and a movable slidevon said base, a reciprocating -mechanism for said Slide comprising a rotary shaft fixed relative to the base an axially adjustable cou ling on said shaft, a radially adjustable cran pin extending from the end of said shaft, a connecting rod from said crank pin to the slide, and means to vary the effective length of said connecting ro 15. In a machine of the class described havin a laterally reciprocatory rotary tool, a wor slide, comprising a positively driven shaft, a main spindle, a rotary member impositively connected to said spindle means to engage the driven shaft with said rotary member, a feed nut and screw device axially alined with said spindle means to connect said feed deviceto said spindle, whereb th spindle is` fed by the rotation thereo and tripping means operated by a predef- .having a laterally reciprocatory rotary tool,

a work head comprising a base portion slidable lo itudinally of the machine, means to sli e said base, an upper portion `having pivotal connection with said base,

whereby to permit angular adjustment relative to the axis of the rotary tool, a main spindle bearin in said upper portion, means to drive sai spindle im ositively,` and means to feed said spindle by the rotation thereof with respect to the upper portion, the base remaining stationary, and mecha-- nism operated by the rotation ofthe spindle adapted to be connected to mechanism for reciprocatin said rotary tool.

17. In a -mac ine of the class described having a rotary tool in one slide, and a rotary work spindle in another slide, rapid feeding means to move the spindle slide,

mechanical feeding means to feed the spin dle with respect to its slide, eccentric mechanism operated by the rotation of the spindle to reciprocate the tool slide an impositive power transmission from the rotary tool to the Work spindle, and automatic tripping means associated with said transmission to render it inoperative.

In testimony whereof, I have hereunto aixed my signature.

JOSEPH C. FLETCHER.

Certificate of Correction.

It is hereby 192'?, upon the certified that in Letters -Patent No. 1,613,577, ranted January 4, application of Joseph C. Fletcher, of Chicago,

llinois, for an improver'nent in Die-Cutting Machines, errors appearlin the printed s ecification requiring correction as follows: Page 2, line 7, for the Word presented read sent/ng, and line 115, for the word looking read Zpolczn 12, for the word slide read drive; and that`the said read with these corrections therein that the case in the Patent 'Oce Signed and sealed this 1st day of February, A. D. 1927.

l.' page 5, line 126, c aim tters Patent should be same may conform to the record of the M. J. MOORE, A timg omma'oner of Patents.

rotation of the spindle to disen- Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,613,577, rented January 4, 1997, upon the application of Joseph C. Fletcher, of Chicago, llinois, for an improvement in Die-Cutting Machines, errors appear in the printed specification requiring correction as follows: Page 2, line 7, for the word presented read pre Santing, and line 115, for the Word looking read Locking; page 5, line 126, claim 12, for the word slide read drive; and thabthe said Letters Patent should be read with these corrections therein that, the same may conform to the record of the case in the Patent Oce.

Signed and sealed this 1st day of February, A. D. 1927.

[SEAL] M. J. MOORE,

Affiti/ng 00mm/:lesionar of Patents. 

